Apparatuses and methods are provided for transporting fluid to a sheet of material. The servo valve has a valve body having a control chamber provided with an outlet passage that is openedclosed by an openclose element that is axially movable. This invention, unlike the prior art for producing SSD-PCB, can readily utilize dry solder powder in conjunction with flux layers 116 separately deposited on top of the conveyor wire mesh 76 thereby excluding the use of solder paste and associated paste printing equipment. In an alternate embodiment, a single current control circuit provides the offset voltage for the entire photocell array. Each of the plurality of tunable filters is operable to selectively tune to a wavelength of one of the plurality of optical router signals to facilitate communication of the packet associated with that optical router signal toward the destination element.